|
1998
|
G/S
|
Paving stones and retaining walls made of stone. |
|
1997
|
Invention
|
Paving block array. A unitary paving block having an exposed surface in use having a multitude of... |
|
|
Invention
|
Paving block |
|
1994
|
Invention
|
Roofing elements. Roofing elements, particularly suitable for use on flat roof constructions, are... |
|
1993
|
Invention
|
Roof tile |
|
|
Invention
|
Composite building element and methods of making and using the same. A composite roofing element ... |
|
1992
|
Invention
|
Lightweight concrete roof tiles and similar products. A lightweight concrete product in the form ... |
|
1991
|
Invention
|
Roof tiles. An interlocking roof tile which can be made by extrusion, pressing or moulding has an... |
|
1990
|
Invention
|
Roof tiles. An interlocking roof tile (1) of which the leading end portion (12) at least as far a... |